About Us

Meets the Challenge. INTERRA has completed large and demanding projects throughout the United States as the prime consultant and as a sub-consultant

Agency Prequalified. INTERRA is prequalified by the Illinois Department of Transportation in the following categories:

Special Services – Construction Inspection

Geotechnical Services – General Geotechnical Services

Geotechnical Services – Structure Geotechnical Reports

Geotechnical Services – Subsurface Explorations

Special Services – Quality Assurance PCC & Aggregate

Special Services – Quality Assurance HMA & Aggregate

Airports – Construction Inspection

Accreditations. INTERRA’s material testing laboratories are accredited by state DOTs, Army Corps of Engineers, and AASHTO to provide common and advanced testing for soils, concrete, hot-mix asphalt, and aggregates

Quality + Client Satisfaction. INTERRA invests in and is fully committed to the use of systems, procedures, and employee training and certifications to sustain high quality standards in everything we do for complete client satisfaction

Safety + Client Satisfaction. INTERRA is a safety-driven organization and has achieved a superior record completing projects without incident for complete client satisfaction